全文获取类型
收费全文 | 1445篇 |
免费 | 123篇 |
国内免费 | 20篇 |
专业分类
儿科学 | 113篇 |
妇产科学 | 9篇 |
基础医学 | 171篇 |
口腔科学 | 75篇 |
临床医学 | 176篇 |
内科学 | 279篇 |
皮肤病学 | 51篇 |
神经病学 | 51篇 |
特种医学 | 249篇 |
外科学 | 119篇 |
综合类 | 43篇 |
预防医学 | 97篇 |
眼科学 | 21篇 |
药学 | 48篇 |
1篇 | |
中国医学 | 2篇 |
肿瘤学 | 83篇 |
出版年
2021年 | 10篇 |
2020年 | 15篇 |
2019年 | 18篇 |
2018年 | 21篇 |
2017年 | 12篇 |
2016年 | 19篇 |
2015年 | 32篇 |
2014年 | 35篇 |
2013年 | 48篇 |
2012年 | 42篇 |
2011年 | 38篇 |
2010年 | 62篇 |
2009年 | 64篇 |
2008年 | 32篇 |
2007年 | 41篇 |
2006年 | 35篇 |
2005年 | 40篇 |
2004年 | 32篇 |
2003年 | 41篇 |
2002年 | 41篇 |
2001年 | 28篇 |
2000年 | 36篇 |
1999年 | 38篇 |
1998年 | 85篇 |
1997年 | 84篇 |
1996年 | 63篇 |
1995年 | 56篇 |
1994年 | 41篇 |
1993年 | 48篇 |
1992年 | 26篇 |
1991年 | 32篇 |
1990年 | 23篇 |
1989年 | 51篇 |
1988年 | 40篇 |
1987年 | 36篇 |
1986年 | 24篇 |
1985年 | 27篇 |
1984年 | 11篇 |
1983年 | 15篇 |
1982年 | 16篇 |
1981年 | 15篇 |
1980年 | 19篇 |
1979年 | 5篇 |
1978年 | 16篇 |
1977年 | 15篇 |
1976年 | 11篇 |
1975年 | 12篇 |
1974年 | 5篇 |
1973年 | 5篇 |
1969年 | 4篇 |
排序方式: 共有1588条查询结果,搜索用时 0 毫秒
1.
Angela J. Jacques-Tiura Deborah A. Ellis April Idalski Carcone Sylvie Naar Kathryn Brogan Hartlieb Elizabeth K. Towner Thomas N. Templin K.-L. Catherine Jen 《The Journal of adolescent health》2019,64(3):355-361
Objective
Successful weight loss interventions for African-Americans adolescents are lacking. Cognitive-behavioral interventions seek to develop weight loss skills (e.g., counting calories, goal setting, managing one's environment). Little is known about how well adolescents implement such skills in their daily lives. Study aims were to (1) examine weight loss skills utilization at midpoint and end of a 6-month cognitive-behavioral/motivational interviewing weight loss sequential multiple assignment randomized trial (SMART), and (2) determine if greater skill utilization predicted weight loss at treatment end and 3 months post-treatment.Method
One hundred and eighty six African-Americans adolescents with obesity and their caregiver were first randomly assigned to complete 3 months of cognitive-behavioral and motivational interviewing family-based weight loss treatment in their home or in the research office (Phase 1). Nonresponders (i.e., those who lost < 3% of initial weight, n?=?161) were rerandomized to 3 months of continued skills training (n?=?83) or contingency management (n?=?78) for Phase 2; responders were allocated to 3 months of relapse prevention (n?=?20). Adolescents’ frequency of weight loss skills utilization was assessed via questionnaire at treatment midpoint and end.Results
Higher treatment attendance was associated with better skill utilization. Higher skill utilization was associated with more weight loss at treatment end, whereas higher baseline confidence was associated with more weight loss at follow-up.Conclusions
This study indicates the importance of attending weight loss intervention sessions to develop and strengthen weight loss skills in African-American adolescents with obesity, and strengthening confidence to use such skills for continued weight loss. 相似文献2.
3.
4.
Pyomyositis: characteristics at CT and MR imaging 总被引:9,自引:0,他引:9
5.
AJ Larner MRCP 《International journal of clinical practice》1994,48(5):272-274
SUMMARY A case is reported of pseudohyperphosphataemia in association with a monoclonal gammopathy of undetermined significance. 相似文献
6.
Magnetic resonance imaging and clinical correlates of intellectual impairment in myotonic dystrophy 总被引:4,自引:0,他引:4
S J Huber J T Kissel E C Shuttleworth D W Chakeres L E Clapp M A Brogan 《Archives of neurology》1989,46(5):536-540
Although intellectual impairment is common in patients with myotonic dystrophy, this aspect of the disease has received relatively little research attention. We examined 41 patients with myotonic dystrophy using objective neuropsychological procedures and magnetic resonance imaging. Ten patients (24%) had severe and generalized intellectual dysfunction, while lesser or no cognitive impairment characterized the remaining patients. Degree of intellectual impairment was not related to neuromuscular status or sex. Patients with severe intellectual disturbance had significantly earlier onset of both myotonia and weakness and were more likely to inherit the disease from their mother. Magnetic resonance imaging findings indicated that while degree of cerebral atrophy was not related to severity of intellectual impairment, skull thickness, focal white matter lesions, and anterior temporal lobe abnormalities were significantly more common in patients with severely disturbed intellect. This study reports a number of previously unreported cerebral magnetic resonance imaging findings associated with intellectual impairment in myotonic dystrophy, but the etiology of these changes awaits neuropathologic examination. 相似文献
7.
8.
D De AJ Kanwar S Handa 《Journal of the European Academy of Dermatology and Venereology》2006,20(7):853-859
BACKGROUND: Diagnosis of atopic dermatitis (AD) depends on clinical features because no definitive diagnostic test exists. Criteria proposed by Hanifin and Rajka (Acta Derm Venereol (Stockh) 1980; Suppl 92: 44-47) were acceptable for hospital-based studies but were found not to be suitable for field studies. A UK working party formulated clinical diagnostic criteria that could be used in both hospital and epidemiological settings. Validation studies of the criteria showed widely variable results, probably due to different clinical settings and ethnicity. AIM AND OBJECTIVE: This study was undertaken to validate Hanifin and Rajka's criteria and to assess the comparative efficacy of their criteria and the UK working party's diagnostic criteria in the diagnosis of AD in a hospital setting in North India. SUBJECTS AND METHODS: This study serially included 101 patients with AD and 48 controls of paediatric age group. The study period was from July 2003 to December 2004. RESULTS: Hanifin and Rajka's criteria (sensitivity 96%, specificity 93.75%, positive predictive value 97% (PPV) and negative predictive value (NPV) 91.84%) had a statistical advantage over the UK working party's diagnostic criteria (sensitivity 86%, specificity 95.83%, PPV 97.75% and NPV 76.67%), with a P-value < 0.005. 相似文献
9.
SUMMARY Impotence is a common symptom which can cause considerable distress to both the sufferer and his partner. The use of pharmacotherapy to improve erectile function will continue to increase as safe and effective drugs are developed. However, restoring erectile function should not be the only treatment objective. It is also essential to address personal and emotional factors in the sufferer, conflicts in his relationship with his partner, and sexual problems in his partner, all of which may be instrumental in causing or maintaining the presenting impotence. We advocate a combined approach with appropriate medical treatment and sex and couple therapy 相似文献
10.
Acute appendicitis: CT and US correlation in 100 patients 总被引:19,自引:1,他引:18